Yeah, the US seems higher than other western countries. I searched a bunch of other western countries (particularly looking for a low end) and found examples below 20% (like switzerland). I found a map that has data on hover: https://vaw-data.srhr.org/map (note the US has lower stats here than 41%). Also https://data.who.int/indicators/i/BEDE3DB/E0D4E17.
IPV data can be inconsistent regarding what it counts (some of them include psychological and emotional IPV, not just physical and sexual). It seems consistently higher the more categories that are included.
Have you looked into and evaluated potential reasons IPV data could be inaccurate?
Not deeply. I did think a bit about it. There are a bunch of possible reasons that come to mind, including some based on culture.